first step to drop \OCP\Config:: in favour of IConfig

apps/files/appinfo/update.php

apps/files_encryption/lib/helper.php

apps/files_encryption/tests/crypt.php

apps/files_external/lib/config.php

apps/files_external/lib/sftp.php

apps/files_sharing/lib/helper.php

apps/files_sharing/tests/api.php

apps/files_sharing/tests/helper.php

apps/files_sharing/tests/share.php

apps/files_trashbin/lib/trashbin.php

apps/user_ldap/appinfo/update.php

apps/user_ldap/lib/access.php

apps/user_ldap/user_ldap.php